In IE, you can debug the browser process with MS Script Debugger (which for some reason is an Office component) or Visual Studio, and then you can see the stack on breakpoints.
If you want the string stack trace, I'd go with insin's answer: stacktrace.js. If you want to access the pieces of a stacktrace (line numbers, file names, etc) stackinfo, which actually uses stacktrace.js under the hood.